Nix Ecosystem Guide

Core Philosophy

1. Declarative over Imperative - Describe desired state, not steps to reach it
2. Reproducibility - Lock files (flake.lock) pin exact versions
3. Immutability - Nix Store is read-only; same inputs = same outputs
4. Rollback - Every generation preserved; instant recovery via boot menu (NixOS) or --rollback (all platforms)

Flake Structure

{
  description = "My Nix configuration";